http://mitsuba-renderer.org/~wenzel/blog/2007/06/the-processor-works/ Sat, 22 Oct 2011 02:52:29 +0000 hourly 1 https://wordpress.org/?v=393 http://mitsuba-renderer.org/~wenzel/blog/2007/06/the-processor-works/#comment-69 Sun, 17 Jun 2007 07:11:25 +0000 http://wazlaf.org/wordpress/?p=97#comment-69 The cause is the built-in cache: Before a kd-Tree-Node or Triangle can be used by the intersection processor, it first has to be loaded from DDR memory into the 1024-line direct mapped cache (48 KB). This takes several cycles and the intersection processor uses a special mechanism so that it doesn’t wait for the data but instead continues with the next thread at once (The cache can be simultaneously acessed by multiple readers/writers). Later, it checks again whether the data has been loaded. The problem occurred when the 3D scene was larger than the cache and a cache line had to be replaced. In this case, the cache generated invalid signals for several cycles which put the intersection hardware into an invalid state.

]]> http://mitsuba-renderer.org/~wenzel/blog/2007/06/the-processor-works/#comment-66 Sat, 16 Jun 2007 21:38:34 +0000 http://wazlaf.org/wordpress/?p=97#comment-66 Can you explain the cause of the error, or is it not understandable by the general geek public?

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